1.1 --- a/README.txt Thu May 18 01:58:26 2017 +0200
1.2 +++ b/README.txt Thu May 18 23:50:22 2017 +0200
1.3 @@ -1,3 +1,26 @@
1.4 +Introduction
1.5 +------------
1.6 +
1.7 +The VGAPIC32 project provides software and circuit information to generate an
1.8 +analogue VGA signal from a PIC32 microcontroller.
1.9 +
1.10 +Contact, Copyright and Licence Information
1.11 +------------------------------------------
1.12 +
1.13 +The author can be contacted at the following e-mail address:
1.14 +
1.15 +paul@boddie.org.uk
1.16 +
1.17 +Copyright and licence information can be found in the docs directory - see
1.18 +docs/COPYING.txt and docs/gpl-3.0.txt for more information.
1.19 +
1.20 +
1.21 +
1.22 +Hardware Details
1.23 +================
1.24 +
1.25 +The pin usage of this solution is documented below.
1.26 +
1.27 PIC32MX270F256B-50I/SP Pin Assignments
1.28 --------------------------------------
1.29
1.30 @@ -21,14 +44,23 @@
1.31 Data Signal Routing
1.32 -------------------
1.33
1.34 -D7 -> 220R -> R
1.35 +For one bit of intensity, two bits per colour channel:
1.36 +
1.37 +D7 -> 2200R -> I
1.38 +
1.39 +I -> diode -> R -> diode -> D7
1.40 +I -> diode -> G -> diode -> D7
1.41 +I -> diode -> B -> diode -> D7
1.42 +
1.43 D6 (not connected)
1.44 +
1.45 D5 -> 470R -> R
1.46 -D4 -> 470R -> G
1.47 -D3 -> 1000R -> G
1.48 -D2 -> 2200R -> G
1.49 -D1 -> 220R -> B
1.50 -D0 -> 470R -> B
1.51 +D4 -> 1000R -> R
1.52 +D3 -> 470R -> G
1.53 +D2 -> 1000R -> G
1.54 +D1 -> 470R -> B
1.55 +D0 -> 1000R -> B
1.56 +
1.57 HSYNC -> 3.3V:5V -> HS
1.58 VSYNC -> 3.3V:5V -> VS
1.59
1.60 @@ -58,3 +90,5 @@
1.61 http://papilio.cc/index.php?n=Papilio.VGAWing
1.62
1.63 http://lucidscience.com/pro-vga%20video%20generator-2.aspx
1.64 +
1.65 +https://sites.google.com/site/h2obsession/CBM/C128/rgbi-to-vga